Preparation of polymer composites containing gold nanonetworks using an amphiphilic poly(oxyethylene) brush

Abstract

We synthesized gold nanonetwork using the amphiphilic polymer brush, poly(oxyethylene) containing decyltri(oxyethylene)thiomethyl (C 1 0 H 2 1 (OCH 2 CH 2 ) 3 SCH 2 -) side groups, as a stabilizer and/or a template. When tetrabutylammonium borohydride solution in THF was added to a mixture solution of the polymer and LiAuCl 4 in THF, 0-D gold nanomaterials were obtained. However, when an aqueous solution of sodium borohydride was added, gold nanonetworks were synthesized. The composites composed of polymer/0-D gold nanomaterials and polymer/ gold nanonetworks showed electrical conductivities of ~10 -9 and ~10 -3S/cm, respectively, which indicated that the gold nanonetworks increased the electrical conductivity.

Morphology and Charge Transport Properties of Chemically Synthesized Polyaniline-poly(ε-caprolactone) Polymer Films

“…The changes in physicochemical properties of PANI occurring in response to various external stimuli are used in various applications, 1,2 e.g., in organic electrode, sensors, and actuators. [3][4][5] Other uses are based on the combination of electrical properties typical of semiconductor with materials parameter characteristics of polymer like the development of "plastic" microelectronics, 1,6 electro-chromic devices, 7 tailormade composite system, 8,9 and "smart" fabrics. 10 The establishment of the physical properties of PANI reflecting the condition of preparation is thus of fundamental importance.…”

Polymer Brushes by the “Grafting to” Method

“…[48][49][50][51][52][53][54][55] Furthermore, thiol and silane substances can bear other functionalities and thereby can bring different chemical groups to a surface for further chemical modifications. Numerous examples exist for the utilization of thiol [18,[56][57][58][59][60][61][62][63][64] and silane [14,16,20,21,33,41, reactions for polymer brush preparation via the ''grafting to'' method. The modification of the surface with a grafted polymer layer can be done in either a single step or two or more steps.…”

“…The presence of a thiol group in the polymer molecule also allows one step ''grafting to'' modification of gold substrates. [18,[56][57][58][59][60][61]63,64] PS, [57,58,64] polyethylene oxide, [18,[56][57][58][59] poly(N-isopropylacrylamide), [60,94] poly[(2-dimethylamino)ethyl methacrylate], [61] and xyloglucan [63] have been attached by the reaction of gold substrate and thiol-terminated polymer chains. For instance, Nordgren et al modified xyloglucan enzymatically to introduce a thiol group into the molecule.…”

Native chitosan/cellulose composite fibers from an ionic liquid via electrospinning

“…[1][2][3][4][5][6][7][8] Polysaccharide-based biomaterials can be designed into various forms and shapes, including membranes, 9 tubes, 10 fibers, 11,12 and beads, 13 for use in medical devices or implants. In particular, nanofibers prepared by electrospinning various synthetic or natural biocompatible polymers are useful as tissue engineering scaffolds, wound healing materials, and as a drug delivery carriers in medical science.…”